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Table 1 Baseline characteristics of 2271 eligible infants. Values are numbers (percentages) unless stated otherwise

From: Predicting developmental dysplasia of the hip in at-risk newborns

Variable Enrolled
(N = 2191)
Declined participation
(N = 80)
Recruited from maternity ward 2123 (96.9) 76 (95)
Referred by family physician 68 (3.1) 4 (5)
Mean age at assessment in days (SD) 3.5 (14.8) 2.1 (5.6)
Lost to follow-up 220 (10) 4 (5)
Received treatment for DDH 76 (3.5) 3 (4)
Female-to-male ratio 1142:1049 44:36
Female sex 1142 (52.1) 44 (55)
First born child 1229 (56.1) unknown
One of twins (twin pregnancy) 285 (13) 6 (8)
Birth weight in grams (mean ± SD) 3220 ± 583 unknown
Oligohydramnios 50 (2.3) 2 (3)
Breech lie in last trimester or at presentation 1419 (64.8) 45 (56)
Breech presentation 640 (29.2) 18 (23)
Breech lie in last trimester with cephalic presentation 779 (35.6) 27 (34)
Vaginal delivery 1020 (46.6) unknown
Caesarean section 1131 (51.6) unknown
First degree family history of DDH 205 (9.4) 3 (4)
Torticollis 12 (0.5) 0 (0)
Foot deformity with orthopaedic follow-up 9 (0.4) 2 (3)
Foot deformity with physiotherapist follow-up 46 (2.1) 3 (4)
Leg length discrepancy (Galeazzi sign) 16 (0.7) 1 (1)
Asymmetry in hip abduction 39 (1.8) 1 (1)
Barlow positive 21 (1) 0 (1)
Ortolani positive 14 (0.6) 1 (1)
Hip instability 27 (1.2) 1 (1)
  1. SD standard deviation